File: ExponentialBackoff.cpp

package info (click to toggle)
llvm-toolchain-20 1%3A20.1.6-1~exp1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 2,111,304 kB
  • sloc: cpp: 7,438,677; ansic: 1,393,822; asm: 1,012,926; python: 241,650; f90: 86,635; objc: 75,479; lisp: 42,144; pascal: 17,286; sh: 10,027; ml: 5,082; perl: 4,730; awk: 3,523; makefile: 3,349; javascript: 2,251; xml: 892; fortran: 672
file content (29 lines) | stat: -rw-r--r-- 1,113 bytes parent folder | download | duplicates (7) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
 
//===- llvm/Support/ExponentialBackoff.h ------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/ExponentialBackoff.h"
#include <thread>

using namespace llvm;

bool ExponentialBackoff::waitForNextAttempt() {
  auto Now = std::chrono::steady_clock::now();
  if (Now >= EndTime)
    return false;

  duration CurMaxWait = std::min(MinWait * CurrentMultiplier, MaxWait);
  std::uniform_int_distribution<uint64_t> Dist(MinWait.count(),
                                               CurMaxWait.count());
  // Use random_device directly instead of a PRNG as uniform_int_distribution
  // often only takes a few samples anyway.
  duration WaitDuration = std::min(duration(Dist(RandDev)), EndTime - Now);
  if (CurMaxWait < MaxWait)
    CurrentMultiplier *= 2;
  std::this_thread::sleep_for(WaitDuration);
  return true;
}